MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS
CALCULATION REPORT OF MAIN/SECONDARY BEAM CONNECTION Shear joint with crossed full-thread screws type GWZ and GWS Last edit date Customer Work site Drafted by Regulations of reference Connection position Connection description
Tuesday, January 24, 2017
EN 1995-1-1: 2008 Connection 1
CONNECTION GEOMETRY Main beam Material Resistance class Width Height Characteristic density Secondary beam Material Resistance class Width Height Vertical inclination Characteristic density
Solid softwood C 14 bHT = 220 mm hHT = 400 mm ρK,HT = 290 kg/m3 Solid softwood C 14 bNT = 220 mm hNT = 260 mm βNT,v = 15 ° ρK,NT = 290 kg/m3
DESIGN LOADS Standards reference EN 1995-1-1: 2008 As regards mechanical strength and screw geometry values, refer to ETA-11/0030 Design loads Shear design Service class Load duration class Load duration coefficient and humidity
Vd = 10 kN Class 1 Permanent kmod = 0.6
Partial safety factors Wooden element junctions Screw shank steel tensile stress
γM = 1.3 γM = 1.25
CHOICE OF THE FASTENING Fastening type Screw type Head type Screw geometry
Full-thread screw type GWS Countersunk head Ø 11 x 250 mm
GH Berechnungssoftware GH Baubeschläge GmbH Austrasse 34 73235 Weilheim / Teck
Page 1 of 4 Tel: +49 (0)7023 743323-0 Fax: +49 (0)7023 743323-29 www.holzbauschrauben.de
MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS
VERIFICATIONS Screw geometry Nominal diameter Screw length Effective calculation length of the thread
d1 = 11 mm L = 250 mm Lef = L/2-20 mm = 105 mm
Withdrawal capacity - Main beam Screw-grain angle direction Withdrawal capacity
αHT = 90°
Fax,HT,Rk = 11626 N Withdrawal capacity - Secondary beam Screw-grain angle direction Withdrawal capacity
αNT = 30°
Fax,NT,Rk = 10110 N Connection design capacity: withdrawal Number of pairs Effective number of pairs
nC = 2 nef = 1.87
Characteristic connection capacity VR,k = 26.68 kN Partial safety factor for timber connection Load duration coefficient and humidity Connection design capacity
γM = 1.3 kmod = 0.6
VRd = 12.31 kN ≥ Vd Connection design capacity: screw shank steel tensile stress Characteristic tensile strength Characteristic connection capacity
(η = 81.21%)
Ftens,Rk = 38 kN VRk = 100.28 kN
Partial safety factor for steel structure Connection design capacity
γM = 1.25
VRd = 80.23 kN ≥ Vd
GH Berechnungssoftware GH Baubeschläge GmbH Austrasse 34 73235 Weilheim / Teck
(η = 12.46%)
Page 2 of 4 Tel: +49 (0)7023 743323-0 Fax: +49 (0)7023 743323-29 www.holzbauschrauben.de
MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS
CONNECTION DESCRIPTION Type of screws Catalogue code Bit
GWS Ø 11 x 250 - 4 screws (2crossed pairs) GWS11250 TX 50 (included in package)
Section mHT pHT
mNT
sHT
sNT 45°
Assembly distance of main beam Assembly distance Insertion depth Insertion depth Screw-in angle
mHT = 135 mm sHT = 65 mm pHT = 46 mm αv = 45 °
hHT
qNT
ENT,v
hNT NT
HT bHT
Assembly distance of secondary beam Assembly distance Insertion depth Distance from lower edge Screw-in angle Vertical inclination
mNT = 110 mm sNT = 25 mm qNT = 68 mm αv = 60 ° βNT,v = 15 °
Distances from edges and spacing Minimum screw spacing Minimum screw spacing Minimum distance from edge
a1,min = 5 d1 = 55 mm a2,cross,min = 1,5 d1 = 17 mm a2,c,min = 4 d1 = 44 mm
Screw spacing Screw spacing Distance from edge
a1 = 55 mm a2,cross = 17 mm a2,c = 74 mm
Plan - 2 or more pairs b NT a2,cross a2,c
a2,c
b HT a1
Note: Screws can be repositioned in compliance with above indicated minimum distances.
GH Berechnungssoftware GH Baubeschläge GmbH Austrasse 34 73235 Weilheim / Teck
Page 3 of 4 Tel: +49 (0)7023 743323-0 Fax: +49 (0)7023 743323-29 www.holzbauschrauben.de
MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS
NOTES 1 All calculations must be verified and approved by the designer/engineer in charge of the works. 2 This calculation report is valid only for main/secondary beam connections made using crossed full thread screws type GWZ and GWS. 3 As regards mechanical strength and screw geometry values, refer to ETA-11/0030 4 When verifying connected wood elements, also verify any orthogonal traction stresses induced by the connection: hanged load for main beam and carved bearing support for secondary beam. 5 The main beam must be fixed and verified taking into account the torsion deriving from connection eccentricity.
GH Berechnungssoftware GH Baubeschläge GmbH Austrasse 34 73235 Weilheim / Teck
Page 4 of 4 Tel: +49 (0)7023 743323-0 Fax: +49 (0)7023 743323-29 www.holzbauschrauben.de